"The biggest mistake is to think becoming a millionaire is impossible," writes Cardone. "The first thing you have to do is decide to become a millionaire, multimillionaire, or billionaire if you want. … Then you must reinforce that decision, over and over."

"For any goal to be achievable, you must believe in its possibility as a realistic and doable goal," writes Cardone. "The way to do this is simply by doing Million Dollar Math. How many different ways can you collect one million dollars?"

If you can figure out a way to get 5,000 people to buy a $200 product, you'd have $1 million, says Cardone. Or, if 5,000 people paid you $17 a month for 12 months, that would also get you to $1 million. Of course, these examples are highly simplified, but the point still stands: "Do the math to create possibility, then create strategy," says Cardone.

"Once you've done the math and realize how real it is to get super rich, you need to focus on increasing your income streams," writes Cardone. After all, self-made millionaires tend to have at least three sources of income.

"There are so many ways to increase your income today," Cardone says, from "internet sales at home writing blogs, editing for authors, releasing a podcast … and on and on." Additional streams could also be real-estate rentals, stock market investments, side businesses, or part-time jobs such as teaching a language or driving for Lyft.

"Ask yourself: 'Who's got my money?'" writes Cardone. "Make a list of who has your money, the money you want, and figure out what you can exchange with them. Whether you have a service, a product, or an idea, the question to ask yourself is always: 'Who's got my money?'

"You don't need to make money, you need to connect with those who've already collected money, who have money, and exchange what you have (skills and knowledge) with what they have (money)."

There's no shortage of money, he says. The key is to get in front of those who have it — investors or potential buyers — and provide them with value.

No matter how much you increase your income, "stay broke," writes Cardone. "I have a policy to never, ever have money sitting around. Once I start increasing income, I immediately moved the surpluses to sacred accounts that were out of my reach and marked for future investments."

This is a way of paying yourself first: Cardone invests his money before paying anyone else. This way, he's never even tempted to spend or waste money that's sitting around.

Plus, when you're broke, you're motivated, he says: "This state of staying broke forced me to continue producing new revenue … and to keep reinforcing the actions that had already proven successful."

"Investing money is how you will get super rich," says Cardone. "The only reason to save money is to one day invest money."

Following Cardone's steps is just the beginning. You have to "repeat and reinforce" these steps, he says, if you want to continue building wealth. But the rewards can be massive: "You can be a billionaire, deca-billionaire, or richer if you simply think bigger from the start and then hyperfocus, and repeat the steps I have laid out."